Solution-method fume desulfurization and denitrification integral process method

Abstract

The invention belongs to the technical field of environment protection, relates to a fume desulfurization and denitrification integral process method, in particular relates to a solution-method fume desulfurization and denitrification integral process method, and is applicable to industrial kiln gas fume desulfurization and denitrification situations. Sodium hypochlorite and sodium chlorite or potassium hypochlorite and potassium chlorite are adopted as a composite absorption solution for fume treatment, the composite absorption solution has a concerted reaction property for oxidizing nitric oxide and absorbing sulfur dioxide, the process method comprises a spraying process, a part of unoxidized acid gases can be reoxidized and absorbed, the fume desulfurization and denitrification efficiency can be improved, the process is simple and convenient and scientific in principle, reasonable utilization of wastes can be achieved, pollution discharge can be effectively reduced, and wide and great social benefits and industrial application values can be made.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of environmental protection, and relates to an integrated process method for flue gas desulfurization and denitrification, in particular to a solution method integrated process method for flue gas desulfurization and denitrification, which is suitable for the occasion of industrial kiln flue gas desulfurization and denitrification. [0003] Background technique: [0004] With the release of my country's ultra-low emission indicators for combustion flue gas and implementation in January 2017, the integrated process of desulfurization, denitrification and even dust removal has become a research and development hotspot for controlling flue gas pollution. It has obvious advantages in terms of resistance, floor area and investment. At present, most integrated desulfurization and denitrification processes are still in the research stage, and a small number of demonstration projects have begun to be applied. ...

AI Technical Summary

Problems solved by technology

Among them, the activated carbon method, the electron beam method or the ozone plus elution method have a large investment, and they do not have an advantage in meeting the ultra-low emission standards; while the chloric acid oxidation plus elution process and the urea-calcium method are all wet oxidation and Absorption can be completed in one tower or two towers in series, and the process is simple and reliable; the use of strong oxidant for desulfurization and denitrification has the advantage of high catalytic activity, but it is easy to cause strong corrosion to equipment; in addition, the recovery of oxidant and the treatment of the solution after absorbing exhaust gas more difficult

In the prior art, Chinese patent CN1923341A discloses a coal-fired boiler flue gas ozone oxidation simultaneous desulfurization and denitrification device and its method, but the amount of ozone injected is relatively large, and the molar ratio to nitric oxide is about 0.5-1.5, It affects the economics of the method, and the high-valence nitrogen oxides NO which are easily soluble in water after oxidation 2 , NO 3 or N 2 o 5 In the process of reacting with lye, a mixture of nitrate and nitrite will be generated, and the waste water after absorption will be expensive to treat, which is not conducive to the recycling of resources

In the prior art, regardless of the oxidation process or the reduction process, reductants such as ammonia or liquid ammonia, or strong oxidants such as ozone or hydrogen peroxide, are usually used, which will cause many problems, such as high purchase costs and transportation costs; and these substances Very volatile and highly irritating, there is a risk of explosion if improperly stored and transported

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